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Proceedings Paper

Giant spin-orbit torque in BiSb/CoFeB heterostructures (Conference Presentation)
Author(s): Yong Chang Lau; ZhenDong Chi; Masamitsu Hayashi

Paper Abstract

We systematically study the spin-orbit torque (SOT) and the thermoelectric effects in sputtered BiSb/CoFeB bilayers using the second harmonic Hall resistance (R2𝜔) technique. The R2𝜔 signal was measured as a function of the azimuthal angle and the magnitude of an external field. We develop a general protocol to unambiguously separate the SOT-induced R2𝜔 signal from that generated by the thermoelectric effects (anomalous Nernst effect, spin Seebeck effect and ordinary Nernst effect). At room temperature, we find a damping-like spin Hall efficiency of ~+0.65 in BiSb/CoFeB heterostructures, which is significantly higher than that found in heavy metal/ferromagnet bilayers. The BiSb thickness dependence, temperature and BiSb alloy composition dependence of R2𝜔 will be discussed in the presentation.

Paper Details

Date Published: 10 September 2019
Proc. SPIE 11090, Spintronics XII, 110900T (10 September 2019); doi: 10.1117/12.2528147
Show Author Affiliations
Yong Chang Lau, The Univ. of Tokyo (Japan)
National Institute for Materials Science (Japan)
ZhenDong Chi, The Univ. of Tokyo (Japan)
National Institute for Materials Science (Japan)
Masamitsu Hayashi, The Univ. of Tokyo (Japan)
National Institute for Materials Science (Japan)

Published in SPIE Proceedings Vol. 11090:
Spintronics XII
Henri-Jean M. Drouhin; Jean-Eric Wegrowe; Manijeh Razeghi, Editor(s)

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